To trust in the Lord, the Messiah, the Deliverer, is our salvation and our only hope. Yet he does not trust us to have this “trust” on our own or of our own will.
If you want something empty, the tomb is the way to go. The point of the manger is that Jesus was in it. The point of the cross is that Jesus was on it.
We worry about the fact our days are as grass – so we try to scratch out a place for ourselves, to make a permanent, lasting place, to climb to higher places and succeed, more often than not, only to hurt each other in the process.